Safety valve installation for steam generators



Nov. 13, 1934. D. M ONICQLL SAFETY VALVE INSTALLATION FOR STEAM GENERATORS Filed Dec. I4} 1932 s Sheets-Sheet Nov. 13, 1934. D. M cNlCOLL' 3 5 SAFETY VALVE INSTALLATION FOR STEAM GENERATORS I Filed Dec. 14. 1952 s Sheets-Sheet .2

Nov. 13, 1934. T D. M NKZOLL 1,930,591

SAFETY VALVE INSTALLATION FOR STEAM GENERATORS Filed Dec. 14, 1932 3 Sheets-Sheet 3 I Wm WM Patented Nov. 13, 1934 SAFETY VALVE INsTALL-AurmmnomsTEAM E GENERATORS 1 Donald MacNicoll, Cardonald, near Glasgow,

Scotland Application December 14, 1932, Serial No. 647,116

1 Claim. (01. 137-53) This invention relates to safety valve installathe outlets from the valves 1 by way of apertures 'tions for steam generators, 11 in the chambers 9. The faces of the pistons The invention has for an object to provide an 3 remote from the valves 1 are adapted to be improved and rugged installation including a pair exposed to pressure steam under the control of of independently operable piston-actuated safety the auxiliary valves 4, such steam passing by way 60, valves having a common inlet and controlled by of pipes 12 from the auxiliary valves 4 to the auxiliary valves with which are associatedasentiouter faces of the pistons 3. The circle at 10, ncl valve and an audible alarm device, the several in Figs. 3 and 4, is the outer periphery of a flange components of the installation being arranged in union for the pipe 12.

:10. a compact manner and being adapted to facilitate The auxiliary valves 4 and the sentinel valve 65,

assembly and dismantling. 5 are housed within a common valve chest 13 A particular object of the invention is to prohaving an inlet branch 14 adapted to be connected vide an improved safety-valve arrangement and to a steam generator and having outlet branches construction in which, when the generator pres- 15 from the valves 4 connected to the pipes 12.

.15. sure exceeds a predetermined amount, the sentil6 denotes the outlet passage from the sentinel my nel valve will be opened and admit steam to the valve 5, connected to the whistle 6. The inlet audible signalling device, and in which, at the branch 14 open into a Chamber p d b same time, one of the auxiliary valves will also low, and common to the auxiliary and sentinel be opened and admit steam to its associated main valves 4, 5.

.20. safety valve, and in which combination, upon still The safety valve chests 10 are bolted to a comfurther increase in steam pressure, the other auxmon branch piece 17 presenting the inlet 2 which iliary valve will open and admit the excess steam latter is adapted to be connected to the steam to the remaining safety valve, whereby failure to generator. notice the opening of the first valve will be taken AS S w n 3 the Operating ve of both 25 care of. safety valves are interconnected by a link 18 for so A safety valve installation constructed in acoperation together. cordance with the invention is illustrated in the e Safety Valve Chests 10 are formed With P- accompanying drawings in which Fig. 1 is a part Wardly directed waste steam branches 19 to which plan part horizontal section, Fig. 2 a part side eleare connected twin branches 20 of a common up- .30- vation part vertical section, Fig. 3 an elevation ris Waste Steam pipe 21. at right angles to Fig. 2, and Fig. 4 an elevation As shown in Fig. 4, one safety valve unit may similar to Fig. 3 but illustrative of a constructionbe detached from the branch piece 17 and from a1 feature not apparent from Fig. 3. the relative waste pipe branch 20 for inspection Referring to the drawings, the installation or repair while the Waste Steam P p 21 is W y 35 shown comprises a pair of independently opersupported by the other safety valve unit.

able safety valves 1 having a common inlet 2 and AS S w in s. 1 and the common inlet 2 normally maintained seated under load due to is hOTiZOntally disposed, While in Figs- 3 a d 4 inlet pressure. Each valve 1 is connected to a i inlet is vertically i p i in underpiston 3 adapted to be displaced in the direc- Stood that the inlet ay be a ra d in y 40 t t impart opening movement t th ivenient position to suit the generator mounting ated valve 1 by steam admitted to one side of the arrangementpiston 3 under the control of a spring-loaded aux- The allXilialy Valves 4 are Substantially Simiiliary valve 4 located remote from the safety valves lar to the Sentinel Va v 5 S own in detail in ver- 1. 5 denotes a spring-loaded sentinel valve in tical Section in parallel with the auxiliary valves 4 and in se- A 1 8 22 is Provided 011 the branch piece ries with an audible alarm device 6 which is supfor a press gauge Other auxiliary nneeplied with steam when the sentinel valve 5 opens tiOIL under a predetermined steam pressure. In Operation, When t generator Steam P The audible al rm devi 6 sho i in th sure exceeds a predetermined amount, the senti- .-5.0 form of a whistle incorporating a spring-loaded nel valve 5 opens and admits steam to the whistle m5 inlet valve 7. 6 so that audible warning is given. One of the The pistons 3 are secured on the safety valve auxiliary valves 4 also opens and admits steam spindles 8 and operate in chambers 9 located to the piston chamber 9 of the associated safety within the safety valve chests 10. The faces of the valve, whereby said safety valve is opened to pistons 3 adjacent to the valves 1 are open to relieve the generator steam pressure. With fur- HQ load due to inlet pressure, an actuating piston' connected to each of said valves, each piston being adapted to be displaced in the direction to impart opening movement to the connected valve by pressure fluid admitted to one side of said piston, unequally spring-loaded auxiliary valves remote from said safety valves and each controlling the passage of pressure fluid to one of said pistons, a spring-loaded sentinel valve in parallel with said auxiliary valves, and set to open at the same pressure as the more lightly loaded auxiliary valve, an audible alarm device in series with said sentinel valve, and a connection controlled by said sentinel valve for admitting fluid pressure to said alarm device. v

DONALD MACNICOLL. 

